package cn.ocean._01sync;

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.common.message.MessageExt;

import java.nio.charset.StandardCharsets;
import java.util.List;

public class Consumer {

    public static void main(String[] args) throws Exception {
        // 创建消费者对象，指定消费者组名
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("sync_group_consumer");
        // 连接mq
        consumer.setNamesrvAddr("127.0.0.1:9876");
        // 消费者订阅主题，表示此消费者消费哪个主题的消息，二级分类可以是*
        consumer.subscribe("sync", "sync_tags");
        // 注册监听器
        consumer.registerMessageListener((List<MessageExt> msgs, ConsumeConcurrentlyContext context) -> {
            for (MessageExt msg : msgs) {
                String result = new String(msg.getBody(), StandardCharsets.UTF_8);
                System.out.println(result);
            }
            // 标记该消息已经被成功消费
            return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
        });

        // 启动消费者
        consumer.start();

    }
}
